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r� Date May 17, 1996 i ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No: 20 186 Address: 3212 North California Street, Stockton, California ARCO Environmental Engineer: Kyle Christie Consulting Co./Contact Person: EIVICON/Jay R. Johnson Consultant Project No: 20805-147.002 Primary Agency/Regulatory ID No: Steve Sasson, San Joaquin County Public Health Services WORKED PERFORMED THIS QUARTER (First- 1996): 1. Performed quarterly groundwater sampling. 2. Compiled and evaluated groundwater monitoring data. 3. Finalized and submitted the Preliminary Investigation Evaluation Report (February 6, 1996) to the regulatory agency. WORKED PROPOSED FOR NEXT QUARTER (Second- 1996): 1. ARCO will continue to perform quarterly groundwater monitoring. The next sampling event is tentatively scheduled for May 1996. Current Phase of Project: Assessment Frequency of Groundwater Sampling: Quarterly Frequency of Groundwater Monitoring Quarterly Is Free Product(FP) Present On Site: No FP Recovered this Quarter: None Cumulative FP Recovered to Date: None Approximate Depth to Groundwater: 49.99 to 51.16 Groundwater Gradient: East 0.003 DISCUSSION (optional): Results of this monitoring event indicated that levels of dissolved gasoline hydrocarbons are consistent with levels detected during previous sampling events. Groundwater gradient is consistent with previous sampling events. Groundwater elevation increased approximately 3.62 feet from the previous sampling event (December 1995). ATTACHMENTS: o Table 1 Groundwater Monitoring Data • Figure 1 Site Location Map • Figure 2 Generalized Site Plan • Figure 3 Groundwater Contour Map (February 16, 1996) • Appendix A Sampling and Analysis Procedures 0 Appendix B Laboratory Analysis Reports and Chain-of-Custody Records cc: Elizabeth Thayer, RWQCB SAC-,N:\P70N0805508051470.2BS-95\qb:1